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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ed31b4052863b78e61e5b64ae5fba3904847b1f829175f47475dbe55e6f30a' 
  AND token = 'ddY59jq2o7XDfKyyEd5MO7S+Q9tdSCW2JxyNkIOwKEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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