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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b053545d677710486b08b4eae3a6998d9a7c2dcf512bdfe021af3152956520f7' 
  AND token = 'CUOxVYV0TLdOPY4Y4VlXNIbuwzSqesGvH1UU6Xz1ve0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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