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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3fa0fdbb0e2f759dc409ea21a089a28d8bb2c65831b690ae3f9ce92c200e540' 
  AND token = '1cTstOPxSEUH1j9h/7kPBWBef/hJycDBZMCj93YLaQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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