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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5be69b77f342de2004df3d428a747f8e41f0794e54cfead664061ab2ba66867' 
  AND token = '8NLBZ2cgJePTWm6dSbINTaAkmfdrzz6aCbkrUspP/vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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