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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c4e467d23dfd687875287a828828f3657473c993d3b6670b3b28cb55a0d7b8' 
  AND token = 'ko7mBKR5dV1quBCLXZq9p0/nLuukFITu18o3oc7Ig9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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