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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2a13f13d43af3b0a824ea67c0dd03511d92a40d4aa66a2f2bbebf3960ce61e' 
  AND token = 'j9cPxDKpbk9Nm2deNaGAi1oKuREISzfco2scrONjNHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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