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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf56942d98f63058e11f67264da6a3cbb2414261d9ebae99c2177af411d3b597' 
  AND token = 'XcsxDgu0vCjtnXDM8NjZ4Q2bco+x4J4Bsvs8cKkKfLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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