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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa6bf63ffc5568a006fa0607af5df64bbf2607aab7ff1914ca887f939fc5267' 
  AND token = 'Sw9RGDxM6P/dP96d8jVOtSG0oeu5DJlveX6Uu55VwSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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