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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552ad767f35db870c525845d01fa8f3c5caebbc75d0c54e9e569a3cad745171a' 
  AND token = '1MR1dZI8ubCD0hkHrhkR1/Ik2M2698om/erN/y8iMMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}