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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1972c1382a001eb5384caf888ddb7453a54901b5ad28fd8ee2662f09ae440711' 
  AND token = 'kNSjrlpZCue51LWiYWyrDKbxShXhQu3PIPxdYVraXf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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