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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b70bfd79c07a8bdf10b92fb9f53b2026e7b2037ab6e14a409c7ce47674e0ca' 
  AND token = 'qHsNEHHQstbgG7C0rYP6HqVyIWntifjArMuW/fYWDo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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