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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbddb70d9acb1167c0f8dc5ed0ccf5b279ba7a30a2033e8032489940f55c0ba' 
  AND token = 'GQQz9ebeqmOOcY0zb/R+RtHdKk4Fc7yPpkj8oEns4fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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