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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbdba6dce3ecfe39f994d94c7c32bcdea880e473e2a1b56107dc03cff9500ca' 
  AND token = 'gEpCw9heP4Gs5jaBYF8QhTzge8MQ/0km9QaIQYYjnrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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