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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d68f657a80fd79b98aa8384276dec5cdf1533c7afb18422182a8682e3a1ee9' 
  AND token = 'GCFWXgS47Mm95PNx11/XvDKc97NamQGPVcbPspdSbY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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