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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a873f0cc2baf8ca40c40411a17124e54b3974fe3bfba72465dfee4569b86f310' 
  AND token = 'dT1itEnAN7NFsGGazPd6LAM5jWpovFgioggwtvA4EKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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