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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8698249a0ff7c6a2478cd63a646a7cf7e10d93cd043e79a2c6a01bab17cfd65a' 
  AND token = 'FZoUedTPzGpWnJwG3zhdBkGNAvDlbYJyRENrHH4QOZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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