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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f61c3534869e59734721ba26209e9c153f3936182b668d1073aedd1f7d019cf' 
  AND token = 'Ii7ePHf/65WX57aiHU0bJdQ7rkaOrJRC+nTS37MBAgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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