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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07656ed6130ba46933fc0320a1caeeb9d184823f952ced02778f046e4405997' 
  AND token = 'YR3sYE3n+d+QgDkcvPNYnP+1EVNluhngQMWIK5R37SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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