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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c3c7dfb1371df64e85421d58e08220903eb54f13c42c6f356fc419673e5b12' 
  AND token = 'J9d6eeF5DX+cXoNAXeMtD2Fbdlpmpv3dreVPFQJrnCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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