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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6618ae259ed5772bf4046fe55c9a6e5ad948e3ffc5b3c497c4062a7a9ecf6c20' 
  AND token = 'Z4wom0iQhdOK5L3BIhhnYKPbxkZ8J44zS1Zxh4qhNj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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