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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856b8d691e3a0ac042432183f9bc0adb028e2e588febd61ad4d8bcacf4175533' 
  AND token = 'G83Avp5v3qzrcfMI2km40SDjB8vgmLDHN327rqkR/RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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