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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca638c0bdaddbbd1fd678bad57b7f3b3af68c88e2e49ebe8b58046d5abd93c81' 
  AND token = '8yhjMBq6h5POKEfFnaHem8tXE7DWPfg/MeHDJqT6p9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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