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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a69a1faf0680719a9ee00ecec1bb482c2babfc6c0823344f9f03f46434d153e' 
  AND token = 'eB3y1Fkcscsqt9ZatlZ0mgCMs/8ccoGqIfHh1YYFATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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