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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78dc82f565aea9f1fa6524f3167e4a1babd7653f9dd282fde8f9a1326e95563e' 
  AND token = 'zzhyOnI3MZ5XKeWa6zxb9yjcyFPuVZf286byG5NDC/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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