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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc930b61dd48d4d5a21d2472b262b3a9e5368502872415e0f493fd01c4d99a9' 
  AND token = '8DYlG+/7YSCl+kSKSwPFP6s2pJHCef5DFD8RmLS1Oo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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