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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a783e1464e8661da3bab46af29f69a2ac8c6b535f20bd6bcba5632c624855c' 
  AND token = 'KcR0u2gh/U883EfIrRGhuMU8L+vKgEHtch8kaS7KUz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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