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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a7857435ed3a82233ef2a6223a0b7cadb100d7569067a4b561e6a4c93bd165' 
  AND token = 'mzL6J3uDTrry3C2R45GTTcKc7Vq+LrBWszNy+E1nj+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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