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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05afab32373ae38c74e3c7e9bc7dc80fcdf5679fec435cddc63f965e723dffab' 
  AND token = '2wnW6v1RN0SX5plk8OqhFMGAEmO4pdpTkZZeUUlgU+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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