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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb74b86d37447b52137a17ef0e94574eabd5fe6682e66fb0a0947d4572a8557a' 
  AND token = 'raucB7o3WlPu5KMn6UwChYD6Y2VTH+6w1xKb/+9eGwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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