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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29403702c584c53c5f298c84c8771f3a8c881062b168a21f013e0eca8e661ae7' 
  AND token = 'IhKm0S6t39NY6e40TwtBbeck7vrDKfRBH0Fd8hdsOys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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