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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84583c65f7110c80e0add7a55686a75602f412205f270bfb41ee7d497f9ac9c' 
  AND token = 'D56s1Dz4EdBHKwEB9sdJFJA3Eqy9Ryxi1Rq0Hc3jwOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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