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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a8cc385ddd4337bb504af81563ba2b3f245ac64f60dbd60b665d0d2eadac10' 
  AND token = 'YWMRu5EjmbeqNVyZzI1/qcX+ApL3iuhj05snvwDz8vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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