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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d12a430d6cd9ad58805ba8d37f314630e9da8602c32897155ad9938e057b01' 
  AND token = '5irqfBM71ZfeOLCtRFiqVg6OtL3gnPkMU7VIfnsy/K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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