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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccd0a828683c27daa4ac86fe88dd0c5d39cd91e540286fc825d0b4412a8321a' 
  AND token = 's2umUoWqvgQ27Aym/UxiSEwCnkiOae5Hcon61R6jDqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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