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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd4bacf9a8d6d13c7568c68fb8b69c40070f831b04cad34eea6f5f62e3189b3' 
  AND token = 'ZZhtsr/3h8nGsYA/x1FWOAVkGlkSXwIGDrdP4e1q7rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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