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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273276d444a25ad5cb0eb7a00daedf86606456b532836435a62513b01c39018c' 
  AND token = 'gdQlkZ6yIPvCEAFUcaN+Kk/BgFZfn7uC9T5d1H2qGRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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