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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebb2858bdd8f56b703bacdd281d82d1e5079c6bb989f0cdc4c8ed2758a73231' 
  AND token = 'ZOKFFESDPv1hrYdx8+oWW48pWtZKF0eRF14x2ki6BDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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