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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3f6426bc8c03a9de949176465b487ff23e1d4b90629cc8146504bbab29fd4a' 
  AND token = 'CFWOeaheG4Ei3UJInRH95lxqCIb8wk5KHKQI1fc1qHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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