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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6a4b5d14b80df2044db7db108008fda9c00374d7384f3d9d3f155512e7d75e' 
  AND token = 'YEHglK5izUc+hgfnHpofgRXvvfp+xWvgMK3ig1ptMOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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