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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948d3802c06d9eb6780ed5c5ec5f0a3f4ac63a858ef01b2cc6c05b08bcf079ce' 
  AND token = 'CAs7sv0BB1qy7isqwaUw9EswD1MrWvN1nE9Tl2n0/Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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