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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2bc3856c1fafc7020d605a7f1539ee8474ea059f02f5393946e6d9c69fd4ec' 
  AND token = 'MOkgfvxXZ3ho4mWpcmLHzIPlOFynDc7D9dGK565u7q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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