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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd28ad4c4d4a044ae271d341b52258227eb901ae87b2c6404cb62bac51b01e1b' 
  AND token = 'CK1UEyLphgrUFgaFP9ftzntPrpk7Q7/R3cvj6M/8F2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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