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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33f40cda8971eb26ce0deae658eeb87d7cc517571945556b2758db4b06438b5' 
  AND token = 'tiBBLR5Tt5oaPz9M3dXLLJoeomikDYOhmQbaZ9QLyds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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