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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe3160eaff31c80816248e51207289d480fa0602e0d0a050878fce7c7ab7cd6' 
  AND token = 'Rau/0c82dN53F80FuOCK0snGbIQCS+Jz5hzwZTcWq9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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