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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4412c164c1aa6217b34f0e3f28af4f9b2b8c9d7d3f77b0f6fba2373b8edaa7c' 
  AND token = 'bxhvxJWxcXLbLuc9QTzIJl0AxaPA6xczFnbrNDtAURo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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