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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f61e1831046f7ede23bbc3d24387ef8e4986957eb469507449e41c986c8ef9' 
  AND token = 'umfQcjO/zHEwW+gp0s8pYEpROuNeFTs2CpRD2oc3FGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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