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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11d7fee9bdffa59c47227623c1fb9bf1510888d82ccf887e374e0eba53d8efe' 
  AND token = 'mL+eipFskhICCwH+9SwPgD1pseJUpptDCJNzWluP4/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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