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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c826bb966fddeafcce59c54da4c071565e9e81a0a389fed4e8858c9a44b20e' 
  AND token = 'tuvfx+X/P51IrLKeXeyU8s7pRux5x6sC+F1M9208WvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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