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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28564bf335a0cb65a5d64cd767081c77cd34f943b7d463bc1d8598d2176d3325' 
  AND token = '1PaeHj/V4AQoZdRON4iEAwiK6kjXMwrRWQaQc2RAAHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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