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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fc4f6ae8cd7ed4574935a546ec849e65713e989326924212f5b1b602e4885d' 
  AND token = 'cs3pDT5nEbvEYiyozR7GaFPzXVTEJ1Zrr66rGci6XmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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