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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6634d6448022d8da0bdd17c7e1c455b297a188c014a33d9552eb9bc8a7d95de1' 
  AND token = 'A4igvmzwnk6krkTRNL2gWyMa3TPkd9Cip6UILf8JOPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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