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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25f5f542dea840eff97adfa45f500bfe955b8d4deb858ab01c3c0b0cf2e6872' 
  AND token = '0cLCkJ0QDuI87GvyFKN4gQ7sHktVrq8ABHfqcUtzddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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