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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2b0f770072f1ef8c0b8c2428dbb75538ffdd6a98ae7356692011082723f67b' 
  AND token = 'h5s3u89TtO7gcJLEYS2k6rTnETCrS4kafWYRt9HBp7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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