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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e4cd76a94a34c2e160d759594ca489fb8f16058ac7b3539478deb5c8dd7023' 
  AND token = 'u68VC7UdOV2lTOrWHSldHQxojBk1GPFAAyYEMs6z308=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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